The pop superstar paid a surprise visit Sunday to Station 312 in Yorkville, and then posted pictures of her visit on Instagram.

The 28-year-old singer was walking her dog in the area when she decided to stop and say hello.

The photos were then posted to her “ladygaga” Instagram account for all of her 3.8 million followers to see.

One photo that shows Gaga posing with several firefighters and had already garnered over 100,000 likes by Monday afternoon.

Beneath it the mega star wrote: “Hung out with the Toronto Firemen today, their Firehouse was beautiful! Great guys!”

Gaga — dressed in a long green jacket and oversized sunglasses — also climbed up into one of the massive trucks to pose for a second photo and beneath it wrote: “TORONTO Firehouse. Jumpin’ Trucks” and a symbol of red kiss lips.

Gaga is in Toronto to play a show at the Air Canada Centre on Wednesday as part of her tour, ArtRave: the ARTPOP Ball.